It is normal for 9-month-old infants not to drink milk powder because they are not accustomed to switching from breastfeeding to formula feeding, but the possibility of gastrointestinal dysfunction, anemia and other pathological factors cannot be ruled out. Breastfed babies can add milk powder as complementary food after 6 months under normal circumstances, but babies may not drink milk powder due to a long time of breastfeeding and are not accustomed to milk powder, which is a normal physiological reaction. This is a normal physiological reaction. Parents can help their infants to adapt to it through guidance, or they can consider changing the brand of milk powder to try it out. Some infants may also have a loss of appetite due to gastrointestinal dysfunction, anemia and other pathological reasons, leading to the phenomenon of not drinking milk powder, you can go to the hospital for a checkup to confirm the cause of the diagnosis of the targeted treatment and treatment.